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| 1 #!/usr/bin/python | 1 # Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 # | |
| 3 # Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 4 # Use of this source code is governed by a BSD-style license that can be | 2 # Use of this source code is governed by a BSD-style license that can be |
| 5 # found in the LICENSE file. | 3 # found in the LICENSE file. |
| 6 | 4 |
| 7 """A wrapper for subprocess to make calling shell commands easier.""" | |
| 8 | |
| 9 | 5 |
| 10 import logging | 6 import logging |
| 11 import subprocess | 7 import subprocess |
| 12 | 8 |
| 13 | 9 |
| 14 def RunCmd(args, cwd=None): | 10 def RunCmd(args, cwd=None): |
| 15 """Opens a subprocess to execute a program and returns its return value. | 11 """Opens a subprocess to execute a program and returns its return value. |
| 16 | 12 |
| 17 Args: | 13 Args: |
| 18 args: A string or a sequence of program arguments. The program to execute is | 14 args: A string or a sequence of program arguments. The program to execute is |
| 19 the string or the first item in the args sequence. | 15 the string or the first item in the args sequence. |
| 20 cwd: If not None, the subprocess's current directory will be changed to | 16 cwd: If not None, the subprocess's current directory will be changed to |
| 21 |cwd| before it's executed. | 17 |cwd| before it's executed. |
| 22 | |
| 23 Returns: | |
| 24 Return code from the command execution. | |
| 25 """ | 18 """ |
| 26 logging.info(str(args) + ' ' + (cwd or '')) | 19 logging.info(str(args) + ' ' + (cwd or '')) |
| 27 p = subprocess.Popen(args=args, cwd=cwd) | 20 p = subprocess.Popen(args=args, cwd=cwd) |
| 28 return p.wait() | 21 return p.wait() |
| 29 | 22 |
| 30 | 23 |
| 31 def GetCmdOutput(args, cwd=None, shell=False): | 24 def GetCmdOutput(args, cwd=None): |
| 32 """Open a subprocess to execute a program and returns its output. | 25 """Open a subprocess to execute a program and returns its output. |
| 33 | 26 |
| 34 Args: | 27 Args: |
| 35 args: A string or a sequence of program arguments. The program to execute is | 28 args: A string or a sequence of program arguments. The program to execute is |
| 36 the string or the first item in the args sequence. | 29 the string or the first item in the args sequence. |
| 37 cwd: If not None, the subprocess's current directory will be changed to | 30 cwd: If not None, the subprocess's current directory will be changed to |
| 38 |cwd| before it's executed. | 31 |cwd| before it's executed. |
| 39 shell: Whether to execute args as a shell command. | |
| 40 | |
| 41 Returns: | |
| 42 Captures and returns the command's stdout. | |
| 43 Prints the command's stderr to logger (which defaults to stdout). | |
| 44 """ | 32 """ |
| 45 logging.info(str(args) + ' ' + (cwd or '')) | 33 logging.info(str(args) + ' ' + (cwd or '')) |
| 46 p = subprocess.Popen(args=args, cwd=cwd, stdout=subprocess.PIPE, | 34 p = subprocess.Popen(args=args, cwd=cwd, stdout=subprocess.PIPE, |
| 47 stderr=subprocess.PIPE, shell=shell) | 35 stderr=subprocess.PIPE) |
| 48 stdout, stderr = p.communicate() | 36 stdout, stderr = p.communicate() |
| 49 if stderr: | 37 if stderr: |
| 50 logging.critical(stderr) | 38 logging.critical(stderr) |
| 51 logging.info(stdout[:4096]) # Truncate output longer than 4k. | 39 logging.info(stdout[:4096]) # Truncate output longer than 4k. |
| 52 return stdout | 40 return stdout |
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